CMake Integration

[vaclav2016]

Hello!

I had modify build process into your parser/builder - I had add (looks like a) full cmake integration:
After sudo make install library will be available for cmake's operator find_package (cjson REQUIRED) - no need write extra cmake-Finder's

Also, I am had merge two libraries (builder+parser) into one, not sure is it interesting for you.

You can check it at:
https://github.com/vaclav2016/cjson

PS: Thanks! nice library !

[LB--]

Hm, your CMake script looks considerably more complex than #67, and I am not entirely convinced about the value of having CMake support for this library anyway. It is nearly always preferable to just add the single source file and single header file into one's own existing build system, is it not? This library is intentionally trivial to build, so it seems a little excessive to add more different build systems to it, no?